Semiconductor Input Control Circuit for Command Synchronization
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Solution Overview
Problem
As the frequency of clock signals in semiconductor devices increases to improve operation speed, they generate unnecessary internal commands due to synchronized input of commands and addresses, leading to inefficient active operations.
Innovation Solution
The semiconductor device incorporates an input control circuit synchronized with internal clock signals to generate internal chip selection signals and command/address signals, and an internal command generation circuit that enables active commands only when specific logic level combinations are met, preventing unnecessary command generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency of clock signal is increased to improve operation speed, then operation speed is improved, but unnecessary internal commands are generated
Solution Approach 1:
The input control circuit applies preliminary anti-action by predicting when unnecessary internal commands would be generated based on the clock signal frequency and command/address input pattern, and proactively preventing their generation through selective inhibition logic that blocks command generation during identified problematic cycles
Solution Approach 2:
The system implements feedback by monitoring the relationship between clock signal frequency, command input timing, and internal command generation status, then using this feedback to dynamically adjust command generation control signals that prevent unnecessary internal commands while maintaining required operations
2Speed
If commands and addresses are iteratively input in synchronization with clock signal, then operation speed is improved, but internal commands for unnecessary operations are generated
Solution Approach 1:
The input control circuit performs preliminary action by analyzing the synchronized command/address input pattern before internal command generation occurs, and pre-configuring control signals that enable or inhibit command generation based on predicted operational validity
Solution Approach 2:
The system uses feedback from monitoring the synchronized input pattern and clock signal relationship to dynamically control internal command generation, ensuring that commands are only generated when corresponding valid operations are required
Data Source
AI summary
A semiconductor device includes an input control circuit and an internal command generation circuit. The input control circuit is synchronized with a first pulse of an internal clock signal to generate an internal chip selection signal and a first internal command/address signal from a chip selection signal and a command/address signal. In addition, the input control circuit is synchronized with a second pulse of the internal clock signal to inhibit generation of the internal chip selection signal. The internal command generation circuit generates a first active command and a second active command which are sequentially enabled when the internal chip selection signal and the first internal command/address signal have a predetermined logic level combination.